EP3196555B1 - Kochmulde mit einer glaskeramik-kochfläche - Google Patents

Kochmulde mit einer glaskeramik-kochfläche Download PDF

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Publication number
EP3196555B1
EP3196555B1 EP16199998.2A EP16199998A EP3196555B1 EP 3196555 B1 EP3196555 B1 EP 3196555B1 EP 16199998 A EP16199998 A EP 16199998A EP 3196555 B1 EP3196555 B1 EP 3196555B1
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EP
European Patent Office
Prior art keywords
ceramic cooking
glass ceramic
cooking surface
glass
cooking plate
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EP16199998.2A
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German (de)
English (en)
French (fr)
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EP3196555A1 (de
Inventor
Birgit Dörk
Matthias Bockmeyer
Thomas Zenker
Evelin Weiss
Gerold Ohl
Martin Taplan
Roland Dudek
Sascha Backes
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Schott AG
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Schott AG
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/688—Fabrication of the plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/06—Arrangement or mounting of electric heating elements
    • F24C7/067—Arrangement or mounting of electric heating elements on ranges
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B32/00—Thermal after-treatment of glass products not provided for in groups C03B19/00, C03B25/00 - C03B31/00 or C03B37/00, e.g. crystallisation, eliminating gas inclusions or other impurities; Hot-pressing vitrified, non-porous, shaped glass products
    • C03B32/02—Thermal crystallisation, e.g. for crystallising glass bodies into glass-ceramic articles
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C10/00—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition
    • C03C10/0018—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition containing SiO2, Al2O3 and monovalent metal oxide as main constituents
    • C03C10/0027—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition containing SiO2, Al2O3 and monovalent metal oxide as main constituents containing SiO2, Al2O3, Li2O as main constituents
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
    • C03C3/085—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
    • C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
    • C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
    • C03C3/093—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium containing zinc or zirconium
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/097—Glass compositions containing silica with 40% to 90% silica, by weight containing phosphorus, niobium or tantalum
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C4/00—Compositions for glass with special properties
    • C03C4/02—Compositions for glass with special properties for coloured glass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/10—Tops, e.g. hot plates; Rings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/10—Tops, e.g. hot plates; Rings
    • F24C15/102—Tops, e.g. hot plates; Rings electrically heated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/08—Arrangement or mounting of control or safety devices
    • F24C7/082—Arrangement or mounting of control or safety devices on ranges, e.g. control panels, illumination
    • F24C7/083—Arrangement or mounting of control or safety devices on ranges, e.g. control panels, illumination on tops, hot plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/08—Arrangement or mounting of control or safety devices
    • F24C7/082—Arrangement or mounting of control or safety devices on ranges, e.g. control panels, illumination
    • F24C7/086—Arrangement or mounting of control or safety devices on ranges, e.g. control panels, illumination touch control
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/74—Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/12—Cooking devices
    • H05B6/1209—Cooking devices induction cooking plates or the like and devices to be used in combination with them
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2204/00—Glasses, glazes or enamels with special properties
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2204/00—Glasses, glazes or enamels with special properties
    • C03C2204/04—Opaque glass, glaze or enamel
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/07—Heating plates with temperature control means

Definitions

  • the invention relates to a cooktop with a glass ceramic cooking surface and at least one arranged under the glass ceramic cooking surface radiator.
  • Lithium aluminosilicate-based glass-ceramics are used because of their low thermal expansion for many applications in which high temperatures and temperature differences occur.
  • glass-ceramic plates are used as cooktops for cooktops.
  • the cooking energy is provided by radiators disposed below the glass ceramic cooking surface. These can be designed, for example, as halogen, radiation or induction radiators.
  • Such glass ceramic cooktops are usually dark colored in the visible range, where they have no or only a small light scattering (haze). Dark colored glass ceramic cooktops are used to visually hide the heating elements located beneath the glass ceramic cooktop and the other components of the cooktop. The least Low scattering makes it possible to arrange display elements under the glass ceramic cooking surface and read through them.
  • glass ceramic cooking surfaces are formed in sufficient material thicknesses. Furthermore, it is known to provide nubs on the underside of the glass-ceramic cooking surface, which is mainly loaded with tension during use. The knobs separate the areas of highest tensile load, which are located in the Noppentälern, of which the strongest surface injuries as potential breaker exits, which form due to the structure of the knobbed mountains. As a result, the strength of the glass ceramic cooking surface can be significantly increased.
  • an optical sensor with a transmitter emitting electromagnetic radiation and a receiver receiving the radiation serves as a touch-sensitive key switch an operating device of an electronic household appliance, such as a glass ceramic hob.
  • an electronic household appliance such as a glass ceramic hob.
  • it is arranged under a glass ceramic cooking surface serving as cover, so that the radiation emitted by the transmitter penetrates through the glass ceramic cooking surface. Through a A portion of the radiation is reflected by the glass ceramic back to the receiver on the cooking surface and the beam path in the beam path, thereby triggering a switching operation.
  • the intrinsic color and the low transmission of the glass-ceramic cooking surface in the visible spectral range have an adverse effect on the desired recognizability and color effect of signal lamps and displays which are provided below the glass-ceramic cooking surface for specific applications. Also disadvantageous act the knobs distorting the representation of arranged under the glass ceramic cooking surface displays. The effect is further enhanced by the displays being often spaced from the glass ceramic cooking surface. This may be necessary, for example, to avoid overheating of the electronic component by reheating through a raised, hot pot.
  • the glass-ceramic material used has as the predominant crystal phase high-quartz mixed crystals (HQMK).
  • the glass-ceramic cooking surface is characterized by a plane, not structured and plane-parallel to the top-aligned bottom.
  • displays can be realized with a comparison with a nubbed cooking surface significantly improved display sharpness.
  • Coatings on the underside can be applied with sharp edges.
  • electrodes of touch-sensitive sensors (touch sensors) as well as pot and pot size sensors can be represented in sharp lines.
  • the glass ceramic cooking surface can be provided with the glass ceramic material used in thicknesses between 2 and 6 mm and thereby have sufficient mechanical stability. It is not described by what measures the glass ceramic with a smooth underside and with thicknesses of only 4 mm achieves sufficient strength with reference to the cited standards.
  • the invention is based on the object to provide a cooktop with a volume-colored and not visible in the visible wavelength range or little scattering glass ceramic cooking surface, which allows high reliability of arranged under the glass ceramic cooking surface touch sensors and at the same time sufficient to comply with the standard specifications mechanical Has strength.
  • the object of the invention is achieved with a cooktop with a glass ceramic cooking surface and at least one arranged under the glass ceramic cooking surface radiator, wherein a controllable by the glass ceramic cooking surface touch sensor for adjusting the power of the at least one radiator directly or indirectly with the glass ceramic cooking surface connected or pressed against this or is arranged spaced therefrom, wherein the glass ceramic cooking surface is formed as a lithium aluminosilicate glass ceramic (LAS glass ceramic) having the following constituents in the following composition (in weight percent): Al 2 O 3 18-23 Li 2 O 2.5 - 4.2 SiO 2 60 - 69 ZnO 0 - 2 Na 2 O + K 2 O 0.2-1.5 MgO 0 - 1.5 CaO + SrO + BaO 0 - 4 B 2 O 3 0 - 2 TiO 2 2,3 - 4,5 ZrO 2 0,5 - 2 P 2 O 5 0 - 3 SnO 2 0 - ⁇ 0.6 Sb 2 O 3 0 - 1.5 AS 2 O 3 0 -
  • the glass-ceramic cooktop has a gradient layer on its surface or toward its surface and the core underneath, wherein the glass ceramic cooktop in the core keatite mixed crystal (KMK) as prevailing crystal phase and in the gradient layer high quartz mixed crystal (HQMK ) as the predominant crystal phase.
  • KMK core keatite mixed crystal
  • HQMK gradient layer high quartz mixed crystal
  • the maximum haze at a wavelength of 630 nm is at most 6%, preferably at most 5%, particularly preferably at most 4%.
  • the Li 2 O content is between 3.0 and 4.2 percent by weight.
  • the TiO 2 content may be limited to a range of 2.3 to 4.0 wt%.
  • the Fe 2 O 3 content is particularly preferably 0.03 to 0.2 weight percent.
  • Such a glass ceramic cooking surface shows a dark coloration in the visible wavelength range with simultaneous low dispersion (Haze).
  • the glass-ceramic cooking surface in the abovementioned composition and the described layer structure has an increased strength compared to known LAS glass-ceramic cooking surfaces. Therefore, the thickness of the glass ceramic cooking surface, which is usually 4mm, can be reduced, while still meeting the relevant standard specifications (EN 60335, UL 858 or CSA 22.2) for the required impact resistance of glass ceramic cooking surfaces. Due to the reduced thickness of the glass ceramic cooking surface to, for example, 3.2mm, the sensitivity and the signal-to-noise ratio and so that the switching safety of arranged under the glass ceramic cooking surface and significantly improved by these contact sensors. It is thus created a cooktop, which meets the standard requirements for the strength of the glass ceramic cooking surface and at the same time allows improved and more reliable operation by means disposed under the glass ceramic cooking surface touch switches, as is known for cooking cooktops known today.
  • a green glass in the above-mentioned composition is first melted, shaped into the desired sheet shape and cut to size.
  • a precrystallized glass-ceramic intermediate product is prepared with high quartz mixed crystal (HQMK) as the predominant crystal phase.
  • HQMK high quartz mixed crystal
  • T max maximum temperature
  • Suitable hold times and maximum temperatures are dictated by a temperature-time range bounded by four straight lines.
  • the at least one touch sensor can be designed as a capacitive sensor or as an optical sensor, in particular as an infrared sensor.
  • a capacitive touch sensor has at least one electrode on or between which a time-varying electric field is built up. The electric field acts through the glass ceramic cooking surface.
  • a finger inserted in the alternating electric field changes the capacitance of the capacitor constructed by the electrodes, which triggers a switching operation by means of a changed voltage or current signal.
  • C is the capacitance of the capacitor
  • ⁇ 0 is the electric field constant
  • ⁇ r is the dielectric constant
  • A is the sensor surface.
  • the thickness of the glass ceramic cooking surface from 4mm to 3mm changes the sensitivity of the capacitive touch switch by 25%. This gain can be used for a more sensitive switching behavior of the touch switch.
  • additional functional layers may be provided between the capacitive touch sensor and the glass ceramic cooking surface without degrading the sensitivity of the touch sensor from being used under a thicker glass ceramic cooking surface.
  • an optical touch sensor infrared sensor
  • an optical touch sensor is at a fixed opening angle of the emitting diode for the infrared radiation in a glass ceramic cooking surface with a reduced thickness, a smaller area illuminated with higher surface intensity than in a glass ceramic cooking surface with a larger thickness.
  • the spatial resolution between adjacent optical touch sensors can thus be improved.
  • At least one luminous element and / or at least one self-illuminating or externally illuminated display is arranged directly or indirectly adjacent to the underside of the glass-ceramic cooking surface or at a distance from the underside of the glass-ceramic cooking surface and that Illuminated element and / or the display illuminated the glass ceramic cooking surface.
  • the lighting elements or displays can be designed, for example, to display a power level set via the touch switches.
  • the reduced thickness of the glass-ceramic cooking surface leads to a reduced offset between the masking and the display or the luminous element.
  • the luminous element or the display can be assigned to the masking more precisely.
  • At the same dye concentration increases with a reduced thickness of the glass ceramic cooking surface continues the viewing angle at which a display or a lighting element with sufficient brightness can be seen.
  • the viewing angle for this consideration is defined as the angle below which 50% of the light intensity is still present in comparison to the vertical and assuming an isotropic emission characteristic of the luminous element or the display.
  • the reduction in the thickness of the glass-ceramic cooking surface leads to a reduction in the discoloration of a display or of a luminous element (in particular in the case of spectrally broadband luminous elements or displays, in particular in the case of white light), if a uniform dye concentration of the glass-ceramic cooking surface is assumed.
  • the ratio of the transmission of the glass-ceramic cooking surface for two wavelengths at the respective thicknesses applies as a measure of the discoloration. Due to the reduced discoloration, an improved white balance can be achieved for white displays and light elements. Originally white displays or lighting elements appear less discolored with a 3.0mm thick glass ceramic cooking surface than with a 4mm glass ceramic cooking surface. Even with an oblique view of the display or lighting element takes place at a thinner glass ceramic cooking surface less discoloration. Warning message, which are preferably emitted by light signals in different signal colors, so can be detected better and error-free.
  • a distortion-free imaging of arranged under the glass ceramic cooking surface displays and lighting elements can be achieved in that the underside of the glass ceramic cooking surface is not structured. Due to the increased strength of the glass ceramic material used for the production of the glass ceramic cooking surface can be dispensed with the usual Noppung the bottom of the glass ceramic cooking surface, the requirements regarding the strength of the glass ceramic cooking surface are maintained. Without nubs and due to the low scattering of the glass ceramic cooking surface in the visible wavelength range, displays and lighting elements are contoured through the glass ceramic cooking surface. The size of displayed symbols, such as numbers or letters, can therefore be reduced as needed. Furthermore, the resolution of the symbols are increased.
  • touch sensors, light elements and displays can be adapted to the respective requirements by providing a transparent and / or between the touch sensor and / or the light element and / or the at least one display on one side and the glass ceramic cooking surface on the other side. or a color transparent and / or a non-transparent and / or a light-scattering intermediate layer is arranged.
  • a clear transparent intermediate layer can for example be applied to a dimpled underside of a glass-ceramic cooking surface and form a flat surface opposite the glass-ceramic.
  • the intermediate layer forms an immersion layer which at least reduces the refraction of light when the light passes from the immersion layer to the glass-ceramic cooking surface.
  • Displays and lighting elements can be so synonymous with genoppt running glass ceramic cooking surface without distortion or, for example, if not completely adapted refractive index of Immersion layer can be perceived with only a slight distortion.
  • the immersion layer is also effective in the infrared range, it is also possible to prevent undesired refraction of the infrared radiation of an optical touch sensor on the knobs, thereby avoiding interference with the function of the optical touch sensor.
  • the electrodes of capacitive touch sensors can be pressed against the immersion layer or connected in a materially bonded manner. This can avoid that moisture or dirt between the electrodes and the bottom of the glass ceramic cooking surface accumulates and affects the function of the capacitive touch sensor.
  • a transparently colored intermediate layer allows subtractive color mixing so that the light emitted by a display or a luminous element has a desired color after passing through the intermediate layer and the glass ceramic cooking surface. As a result, a color compensation of the inherent color of the glass ceramic cooking surface is made possible.
  • a non-transparent intermediate layer for example, a masking of a luminous element can take place in order to represent a symbol.
  • a non-transparent or strongly scattering intermediate layer it is also possible to avoid viewing the hob in the area of capacitive touch sensors.
  • the intermediate layer can be designed, for example, as a layer applied directly to the underside of the glass-ceramic cooking surface or as a film.
  • the glass-ceramic cooking surface is provided on its underside at least partially with a non-transparent in the visible spectral range scattered light cover.
  • a non-transparent scattered light cover may preferably be arranged outside the hot areas and outside display and display areas. It prevents even in strong reflected light an undesirable insight into the cooking pan. This is especially true for a reduced in thickness glass-ceramic cooking surface, which has the same volume coloring increased transparency in the visible range.
  • Uncoated areas for example in the form of symbols, can be recessed in the scattered-light cover. The symbols can then be recognized by a corresponding backlighting from the top of the glass ceramic cooking surface.
  • the scattered light cover for example, by a sieving process, contoured to the glass ceramic bottom can be applied. Symbols can thus be displayed with a high resolution. Display and hot areas can also be left out with a sharp borderline.
  • sensor surface elements and / or sensor conductor tracks and / or sensor contact points are applied directly or indirectly to the glass ceramic cooking surface and / or that sensor electrodes directly or indirectly to the glass ceramic -Koch Structure applied or pressed against these.
  • the sensor surface elements or sensor conductor tracks can be formed, for example, by a partial electrically conductive coating of the glass-ceramic underside.
  • opaque or transparent electrically conductive materials can be used.
  • the sensor electrodes can be pressed for example as metal parts from below to the glass ceramic cooking surface.
  • various functions can be realized with such sensor structures. For example, an inductive or capacitive pan detection or pot size detection can be performed.
  • the temperature of the glass-ceramic cooking surface in the hot region can be determined. For this purpose, for example, a change in resistance of a sensor conductor track or a glass ceramic section arranged between two sensor conductor tracks can be measured and evaluated accordingly. Based on the temperature measurement various control functions of the hob can be realized. For example, overheating of the glass ceramic cooking surface can be avoided. Furthermore, for example, depending on a present quality of an erected cookware, a power redistribution between the heating circuits of a multi-circuit radiator can be made. Also conceivable is an automated control of a cooking process based on the detected glass-ceramic temperatures.
  • the sensor structures can furthermore be used as electrodes of capacitive touch sensors.
  • capacitive touch sensors can be arranged between a display or a luminous element and the glass-ceramic cooking surface.
  • This allows, for example, an intuitive user guidance of the cooktop, in which switching operations on touch sensors trigger different events as a function of the respective content of the stored display. Due to the reduced thickness of the glass ceramic cooking surface have the described sensors improved sensitivity.
  • switching and control operations can be carried out with greater accuracy and reliability. It also has an advantageous effect if the glass-ceramic underside is not structured but smooth. The sensor surface elements, sensor tracks and sensor electrodes can thus be applied to the underside of the glass ceramic cooking surface with better contour accuracy and a more uniform thickness.
  • inductive or resistive measurements can be done with a much improved accuracy.
  • capacitive, inductive or resistive measurements can be done with a much improved accuracy.
  • pressed-on sensor electrodes in contrast to a structured glass-ceramic underside, there is no changing gap between the sensor electrodes and the glass-ceramic. This can be avoided, for example, that dirt or moisture gets between the electrodes and the glass ceramic cooking surface and falsifies the measurement result.
  • the maximum "haze" at a wavelength of 470 nm is at most 15%, preferably at most 12% and / or that the maximum Haze in a wavelength range of 400nm to 500nm at most 20%, preferably at most 17%, and / or that the maximum Haze at a wavelength of 630nm is at most 6%, preferably at most 5%, particularly preferably at most 4%.
  • the proportion of scattered light is measured according to the international standard ISO 14782: 1999 (E).
  • the glass-ceramic cooking surface of the cooktop according to the invention thus differs in particular from known glass-ceramic cooking surfaces with a high Keatitmischkristall share, which appear due to a large number of scattering centers translucent to opaque and thus are not suitable for use in conjunction with displays.
  • the light transmittance in the wavelength range of 380nm to 780nm is less than or equal to 5%, preferably 10%.
  • the spectral transmission at a wavelength of 420 nm is greater than 0.2%
  • the glass ceramic cooking surface in supervision looks black.
  • displays and light elements can be well recognized and read through the glass ceramic. Also operated radiators can be perceived in sufficient brightness.
  • An improved display capability of displays and luminous elements can be achieved in that the glass ceramic cooking surface contains coloring metal ions, wherein the transmission of the glass ceramic cooking surface is increased in a display area by a locally induced by electromagnetic radiation local heating in relation to an adjacent area. In such areas of increased transmission, associated displays and lighting elements can be better recognized and read. Furthermore, the shift of the color locus of the display or the luminous element is reduced within such a display area.
  • a good readability of an arranged under the glass ceramic cooking surface and the display area display and good visibility of a likewise arranged there lighting element can be achieved that in a wavelength range of 380nm to 780nm and in the display area, the light transmittance of the glass ceramic cooking surface is less than or equal to 2 , 5% or that the light transmittance is between 2.5% and 5%, or that the light transmittance is less than or equal to 10%. With a light transmittance of less than or equal to 2.5%, it is also possible to reliably avoid viewing the hob while the display or lighting unit is not lit within the display area.
  • the display or the luminous element are arranged within a display region of the glass-ceramic cooking surface with an increased light transmittance with respect to the surrounding glass-ceramic material. This ensures, on the one hand, the good readability of the display or the recognizability of the light-emitting element and, on the other hand, prevents the glimpse of the cooktop in the glass-ceramic material surrounding the display area.
  • Fig. 1 shows a schematic representation of a section of a cooking hob 10 with a glass ceramic cooking surface 11, a radiator 12 and an electronic assembly 20th
  • the radiator 12 which is designed in the present embodiment as a radiant heater is pressed by means of spring elements 13 which are supported on a cooktop bottom 14 against a bottom 11.2 of the glass ceramic cooking surface 11.
  • the radiator 12 has a heating coil 12.2 and a protective temperature limiter 12.1. Of the Protective temperature limiter 12.1 interrupts the power supply to the heating coil 12.2 when the temperature of the glass-ceramic cooking surface 11 exceeds a predetermined threshold.
  • the radiator 12 defines a hot area, which is marked on a top 11.1 of the glass ceramic cooking surface 11 as a cooking zone 15 and on a cookware, such as a saucepan, can be placed. By the radiator 12, the cookware and stored therein cooking material is heated, as symbolized by a power flow 30 shown.
  • the energy flow 30 is composed predominantly of radiant energy emitted by the heating coil 12. 2 and energy transmitted by thermal conduction in the region of the glass-ceramic cooking surface 11.
  • energy losses occur, as shown here using the example of a heat transmission line 31 within the glass ceramic cooking surface 11.
  • the glass ceramic cooking surface 11 has a thickness 50 marked by a double arrow and reduced in thickness compared with known glass ceramic cooking surfaces. It is glued with a flexible adhesive 16.1 in a frame 16 of the hob 10. The frame 16 is connected to the cooktop bottom 14.
  • the electronic assembly 20 is pressed by means of a spring element 13 to the underside 11.2 of the glass ceramic cooking surface 11. It comprises in the embodiment shown a display 21 and a touch sensor 22.
  • the display 21 may be embodied, for example, as a seven-segment display or as a graphic display. From the radiator 12, the electronic assembly 20 is spaced by a distance 53.
  • Luminous elements 23 are arranged in the illustrated embodiment as a self-luminous cooking zone marking on the outer edge of the radiator 12.
  • the glass-ceramic cooking surface 11 has the following composition given in weight percent: Al 2 O 3 18-23 Li 2 O 2.5 - 4.2 SiO 2 60 - 69 ZnO 0 - 2 Na 2 O + K 2 O 0.2-1.5 MgO 0 - 1.5 CaO + SrO + BaO 0 - 4 B 2 O 3 0 - 2 TiO 2 2,3 - 4,5 ZrO 2 0,5 - 2 P 2 O 5 0 - 3 SnO 2 0 - ⁇ 0.6 Sb 2 O 3 0 - 1.5 AS 2 O 3 0 - 1.5 TiO 2 + ZrO 2 + SnO 2 3.8 - 6 V 2 O 5 0.01-0.08 Fe 2 O 3 0.03 - 0.3
  • further color oxides can be contained up to a maximum proportion of 1.0 percent by weight.
  • the Li 2 O content is preferably in the range of 3.0 to 4.2 percent by weight
  • the TiO 2 content is preferably in the range of 2.3 to 4.0 percent by weight
  • the Fe 2 O 3 content is 0 , 03 to 0.2 percent by weight limited.
  • a green glass in the abovementioned composition is first of all melted, shaped into the desired plate shape and cut to size.
  • a precrystallized glass-ceramic intermediate product is prepared with high quartz mixed crystal (HQMK) as the predominant crystal phase.
  • HQMK high quartz mixed crystal
  • T max holding time
  • a glass-ceramic cooking surface 11 with a surface facing the glass-ceramic cooking surface 11 is formed aligned gradient layer and an underlying core.
  • Keatitmischkristall (KMK) is present as the predominant crystal phase.
  • the gradient layer has high quartz mixed crystal (HQMK) as the predominant crystal phase.
  • HQMK high quartz mixed crystal
  • the CMK crystal phase fraction at a depth of 10 ⁇ m or more exceeds 50% of the sum of the HQMK and KMK crystal phase portions.
  • An amorphous layer is preferably formed above the gradient layer.
  • the glass-ceramic cooking surface 11 produced in this way has, in the stated composition, an increased strength compared to known LAS-based glass-ceramic cooking surfaces 11 with the same material thickness. Therefore, as in FIG. 2 indicated, glass ceramic cooking surfaces 11 are used with respect to a conventional thickness 51 of reduced thickness 50 for hobs 10. In doing so, the requirements of the relevant standards (EN 60335, UL 858, CSA 22.2) are still met.
  • the usual thickness 51 lies in the case of glass ceramic cooking surfaces 11 used in the private household appliance sector in a range of 3.8-4.2 mm.
  • the glass ceramic cooking surfaces 11 according to the invention can be used up to a reduced thickness 50 of greater than or equal to 2.8 mm, while still meeting the said standard requirements with respect to the strength of the glass ceramic cooking surfaces 11.
  • Such a reduced thickness 50 of the glass ceramic cooking surface 11 leads to significant improvements in the operation of the hob 10. How to FIGS. 2 and 3 explained in more detail, the reduced thickness 50, the response of touch sensors 22 can be significantly improved. How to the FIGS. 4 and 5 is explained by the reduced thickness 50, the transmission of information by means of displays 21 or lighting elements 23, which are arranged under the glass ceramic cooking surface 11, significantly improved. For example, in the embodiment according to FIG. 1 provided cooking zone marking by means of lighting elements 23 due to the reduced thickness 50 of the glass ceramic cooking surface 11 reduced parallax error even at an oblique angle more accurate the actual position of the radiator 12 are assigned.
  • the energy flow 30 can be further improved by the radiator 12 to a set up, not shown, cookware.
  • the by the Glass ceramic cooking surface 11 formed thermal mass is reduced, resulting in an increased reaction rate to changes in performance of the radiator 12 and thus an improved controllability of a cooking process.
  • a greater proportion of the thermal radiation emitted by the heating coil 12.2 reaches the mounted cookware.
  • the energy losses of the cooktop are reduced at a reduced thickness 50 of the glass ceramic cooking surface 11.
  • r is the radius of the cooking zone
  • d is the respective thickness 50, 51 of the glass-ceramic cooking surface 11, the density (2.6 g / cm3)
  • cp the specific heat capacity (0.8 J / (g ⁇ J)) of the glass ceramic and ⁇ T a temperature increase in the region of the cooking zone 15.
  • the heat transmission line 31 as a cause of energy loss also decreases in proportion to the reduction made in the glass ceramic thickness.
  • .DELTA.Q ⁇ ⁇ A ⁇ t ⁇ .DELTA.T / I
  • ⁇ is the thermal conductivity (1.6 W / (m ⁇ K))
  • A is the cross-sectional area in the propagation direction of the energy flow
  • t is the time of heat transport
  • ⁇ T is the temperature difference between the hot region and a surrounding cold region
  • I is the distance between the hot region and the cold area.
  • a further energy saving results from the fact that with reduced thickness 50 of the glass ceramic cooking surface 11 between the glass ceramic bottom 11.2 and the glass ceramic top 11.1 a smaller temperature difference must be present to a certain energy per unit time by heat conduction through the glass ceramic cooking surface 11 transport.
  • the temperature of the glass-ceramic underside can thus be selected to be lower in the case of a thinner glass-ceramic cooking surface 11 than in the case of a thicker glass-ceramic cooking surface 11, which leads to lower energy losses to the environment.
  • the glass-ceramic cooking surface 11 according to the invention has a suitable coloring in the visible wavelength range with simultaneously low scattering (Haze). Displays 21 and lighting elements 23 can thus be perceived or read through the glass-ceramic cooking surface 11. There are no or only small stray light losses. At the same time the coloring prevents unwanted insight through the glass ceramic cooking surface 11 into the cooking hob 10th
  • Fig. 2 shows a schematic representation of a section of a glass ceramic cooking surface 11 with an optical touch sensor 22nd
  • the glass ceramic cooking surface 11 is first shown in a standard thickness 51 of 4 mm.
  • a dashed line the course of the upper side 11.1 of the glass ceramic cooking surface 11 at a reduced thickness 50 of the glass ceramic cooking surface 11 of present 3.0 mm is indicated.
  • Fig. 3 shows a schematic representation of a section of a glass ceramic cooking surface 11 with a capacitive touch sensor 22.
  • Electrode 22.1 of the capacitive touch sensor 22 is mounted on a board 22.2 and pressed against the bottom 11.2 of the glass ceramic cooking surface 11.
  • an electric field 22.3 is formed, which penetrates the glass-ceramic cooking surface 11 according to the invention with a reduced thickness 50.
  • embodiments of capacitive touch sensors with more than one electrode in the context of the invention can be used.
  • C the capacitance of the capacitor
  • ⁇ 0 the electric field constant
  • ⁇ r the Dielectric constant
  • A the effective capacitor area between the electrode 22.1 and the finger.
  • the increased sensitivity as well as the improved signal-to-noise ratio can be used to improve the reliability of the capacitive touch sensor 22.
  • the improved sensitivity for between the capacitive touch sensor 22 and the bottom 11.2 of the glass ceramic cooking surface 11 arranged functional additional layers, such as an immersion layer or a film with thick, immersion-effective adhesive layer can be used.
  • the additional layer and the glass-ceramic cooking surface 11 are preferably coordinated so that the total sensitivity of the capacitive touch sensor 22 corresponds to an application under a glass ceramic cooking surface 11 in the usual thickness 51 without additional layer. It is also conceivable to reduce the sensor area A of the capacitive touch sensor 22, that is to say in particular the area of the electrodes 22.1, in accordance with the achieved increase in sensitivity. By this measure finer sensor structures can be achieved.
  • the underside 11.2 of the glass ceramic cooking surface 11 is not structured, in particular not napped executed.
  • the electrode 22.1 bears directly against the underside 11.2 of the glass-ceramic cooking surface 11.
  • Noppentäler in which between the bottom 11.2 of the glass ceramic cooking surface 11 and the electrode 22.1 dirt or moisture can accumulate, are avoided.
  • the reliability of the capacitive touch sensor 22 can be significantly improved.
  • Fig. 4 shows a schematic representation of a section of a glass ceramic cooking surface 11 with a luminous element 23 and a top coating 40th
  • a luminous element 23 is disposed directly on the underside 11.2 of a glass ceramic cooking surface 11.
  • the glass ceramic cooking surface 11 has a reduced thickness 50 of 3.2 mm in the present embodiment.
  • the top coating 40 is applied on the top 11.1 of the glass ceramic cooking surface 11, the top coating 40 is applied.
  • the topcoat 40 may be For example, be a ceramic color, which was applied before the ceramization process on the top of the green glass and baked during the ceramization.
  • the topcoat 40 is opaque.
  • the top coating 40 has a recess 40.1, through which the light of the luminous element 23 can emerge from the glass-ceramic cooking surface 11. Shown are a to the glass ceramic cooking surface 11 perpendicularly extending light beam 54.1 and an obliquely extending light beam 54.2.
  • the oblique light beam 54.2 starting from the luminous element 23, is aligned towards the edge of the recess 40.1. Between the vertical light beam 54.1 and the oblique light beam 54.2, a maximum possible viewing angle 55 is formed, below which a light beam emanating from the luminous element 23 can still exit through the recess 40.1 in the upper side coating 40.
  • the maximum viewing angle 55 increases with the same upper-side masking, below which a luminous element 23 or a display 21 arranged opposite the recess 40.1 can still be seen.
  • a diameter D of the recess 40.1 of 2mm results for a 4mm thick glass ceramic cooking surface 11, a maximum viewing angle 55 of 14 °, while in a 3mm thick glass ceramic cooking surface 11, a maximum viewing angle 55 of 18.4 ° possible is. Accordingly, for a diameter D of the recess 40.1 of 4mm and a 4mm thick glass ceramic cooking surface 11 results in a maximum viewing angle of 25.6 ° and for a 3mm thick glass ceramic cooking surface 11 of 33.7 °.
  • Fig. 5 shows a schematic representation of a section of a glass ceramic cooking surface 11 with a luminous element 23. Accordingly FIG. 4 the luminous element 23 is arranged directly on the underside 11. 2 of a glass-ceramic cooking surface 11 reduced in its thickness 50. For the following consideration, an isotropic radiation distribution of the luminous element 23 is assumed. Shown are a the glass ceramic cooking surface 11 perpendicular traversing light beam 54.1 and a thereto in a viewing angle 55 obliquely extending light beam 54.2. The path through which the perpendicular ray of light 54.1 passes within the glass-ceramic cooking surface 11 corresponds to its presently reduced thickness 50.
  • the path that the oblique light ray 54.2 runs within the glass-ceramic cooking surface 11 is longer in proportion to the viewing angle 55 in the illustration by a double arrow 52 is indicated. Due to the longer path within the glass ceramic cooking surface 11, the intensity of the oblique light beam 54.2 is reduced after exiting the glass ceramic cooking surface 11 relative to the vertically extending light beam 54.1 due to increased absorption losses.
  • the illustrated viewing angle 55 represents the angle at which the intensity of the oblique light beam 54.2 corresponds to 50% of the vertically extending light beam 54.1, in each case after exiting the glass-ceramic cooking surface 11.
  • T i is the internal transmission.
  • the spectral transmittance in the Lambert-Beer law always refers to the internal transmission T i , ie only to the transmissive portion of the total light flux. Reflective components are already deducted from the total light flux.
  • the viewing angles 55 in which the light intensity of the oblique light beam 54.2 is 50% of the perpendicular light beam 54.1, calculate.
  • T transmittance
  • T transmittance
  • the viewing angle 55 for a 3 mm thick glass-ceramic cooking surface 11 is calculated to be 29.9 °.
  • the viewing angle 55 By using a glass-ceramic cooking surface 11 with a reduced thickness 50, therefore, the viewing angle 55, with which, for example, a display 21 can still be read with sufficient brightness, can be significantly improved.
  • Another advantage of the reduced thickness 50 of the glass-ceramic cooking surface 11 results with respect to the discoloration of arranged under the glass ceramic cooking surface 11 lighting elements 23 and 21 displays, especially in broadband spectral broadband elements or displays, especially in white light.
  • the measure of the discoloration is the ratio V of the transmission for two wavelengths w1 and w2 at two thicknesses 50, 51 d1, d2 of the glass-ceramic cooking surface 11.
  • the thinner glass ceramic cooking surface 11 may have a thicker glass ceramic surface compared to the thicker glass ceramic cooking surface 11.
  • V2 ⁇ w 1, d2 / ⁇ w 2, d2
  • the reduced discoloration simplifies white balance for light elements 23 and displays 21. Arranged under the glass ceramic cooking surface 11 lighting elements and displays are not discolored so much at a reduced thickness 50 of the glass ceramic cooking surface 11.
  • the reduced discoloration has an effect, in particular, on an oblique view of the luminous element 23 or the display 21. Warnings, which are preferably made by different colors of the light-emitting element 23 and the display 21, can be better recognized.
  • Fig. 6a shows a schematic side view of a section of a glass-ceramic cooking surface 11 with a nubbed bottom 11.2 and one arranged below at a distance 53 display 21.
  • the display 21 is in the present case designed as a seven-segment display
  • Fig. 6b shows the in Fig. 6a shown section of the glass ceramic cooking surface 11 in a plan view. Due to the action of the knobs 11.3, the display 21 is strongly recorded. This effect is enhanced with increasing distance of the display 21 to the bottom 11.2 of the glass ceramic cooking surface 11. Finely structured symbols can therefore not be displayed with a dimpled underside of the glass-ceramic cooking surface 11, as required for known glass-ceramic cooktops 11, and even with coarser symbols, error-free reading can be made more difficult.
  • Fig. 7a shows a schematic side view of a section of a glass ceramic cooking surface 11 with a smooth bottom 11.3 and a spaced-apart display 21. According to the Figures 6a and 6b the display is again executed as a seven-segment display.
  • Such a smooth, non-structured underside 11.3 is made possible by the described glass-ceramic cooking surface 11 according to the invention, even at a reduced thickness 50, while still meeting the requirement, in particular the impact resistance of the glass ceramic cooking surface 11.
  • Fig. 7b shows the in Fig. 7a shown section of the glass ceramic cooking surface 11 in a plan view. Compared to the representation in FIG. 6b the display 21 appears sharp and without distortions. Due to the non-structured underside 11.2 and the low scattered light content (Haze) of the glass ceramic cooking surface 11 according to the invention thus also finely structured symbols can be represented by the glass ceramic cooking surface 11 and recognized.
  • Fig. 8a shows a schematic representation in a view from below of a section of a glass ceramic cooking surface 11 with a dimpled bottom 11.2.
  • the knobs 11.3 are arranged regularly on the bottom 11.2.
  • the coating 41 On the underside 11.2 two webs of a coating 41 are applied at a distance 53 to each other.
  • the webs are representative of a variety of possible coatings 41, which may be applied with different function on the bottom 11.2 of the glass ceramic cooking surface 11.
  • the coating 41 may be provided as an opaque scattered light cover. Such scattered light covers are preferably applied outside the hot areas of the glass ceramic cooking surface 11 in order to prevent even with a strong reflected light insight through the glass ceramic cooking surface 11 into the hob 10.
  • a transparent and colored coating 41 may be applied in the region of a display 21 or a luminous element 23.
  • the color representation of the display 21 or of the luminous element 23 can be adapted through the glass-ceramic cooking surface 11 by subtractive color mixing.
  • the coating 41 may also consist of an electrically conductive material. This may be transparent, for example in the form of an ITO layer, or opaque, for example as a gold coating. With such a conductive coating 41, for example, in FIG. 3 shown electrodes 22.1 of a capacitive acting Touch sensor 22 to be made. If these electrodes 22.1 are made transparent, then a display 21 or a luminous element 23 can be arranged behind them. With such a display 21 an intuitive user guidance can be made possible. In this case, a different switching operation is triggered by the touch sensor 22 in dependence on the respective present display content.
  • an electrically conductive coating 41 is guided in a hot region of the glass-ceramic cooking surface 11.
  • the coating 41 can be embodied there as a surface element or as a conductor track of a sensor.
  • a sensor allows, for example, the determination of the temperature of the glass-ceramic cooking surface 11 in the hot region.
  • a resistance change along a conductor track produced from the electrically conductive coating 41 can be measured and evaluated.
  • a multiplicity of functions can be made possible, for example the limitation of a maximum temperature of the glass-ceramic cooking surface 11 or a power redistribution between the heating circuits of a multi-circuit heating element depending on the quality of the cookware set up.
  • a sensor may be configured to detect a raised pot or its size. For this purpose, capacitive or inductive acting methods are known.
  • a disadvantage for the mentioned applications is the lack of contour sharpness of the coating 41, as it is dependent on the selected coating method by the nubs 11.3. Possible coating methods include screen printing, spraying or steaming. Due to the lack of contour sharpness distances 53 adjacent coating areas can not be met exactly. Symbols, which are provided as backlit recesses in scattered light covers, can be displayed only in a rough degree of detail. Electrical measurements between adjacent sensor tracks can be corrupted by the varying distances 53. Likewise, the area can not be maintained exactly, for example, by electrodes 22.1 or by sensor surface elements. This can lead to disruptions, for example Operation of capacitive touch sensors or capacitive sensor surface elements lead to pot detection.
  • Fig. 8b shows a schematic representation in a view from below of a section of a glass ceramic cooking surface 11 according to the invention with a non-textured bottom 11.2.
  • coating 41 a dimpled bottom 11.3, the coating 41 of the smooth bottom 11.3 a high sharpness of focus.
  • the increased strength of the glass-ceramic cooking surface 11 according to the invention has a further advantageous effect.
  • different types of coatings 41 can only be made possible without unduly reducing the strength of the glass-ceramic cooking surface 11.
  • Fig. 9a shows a schematic side view of a section of a nubbed glass-ceramic cooking surface 11 with a lower-side coating 41, as they already to the FIGS. 8a and 8b was described in their possible structure and function.
  • the nub structure forms an uneven layer thickness of the coating 41.
  • the layer thickness is particularly enhanced in the Noppentälern and reduced to the Noppenbergen.
  • Such an inhomogeneous layer thickness can lead to impairments of the previously described functions of the coating 41.
  • translucent areas can be formed on the studded mountains if opaque scattered-light covers are desired. When the glass ceramic cooking surface 11 is backlit, these appear as unwanted points of light.
  • electrical resistances of conductive coatings 41 can not be made with sufficient accuracy.
  • Fig. 9b shows a schematic side view of a section of a non-structured glass-ceramic cooking surface 11 with a lower-side coating 41st
  • the layer thickness of the coating 41 applied on the underside is very homogeneous and constant.
  • the too FIG. 9b described disadvantages of a coating 41 on a known, bottom nubbed glass ceramic cooking surface 11 can be avoided.
  • Fig. 10 shows a schematic side view of a section of a glass ceramic cooking surface 11 with a display area 11.4.
  • the display area 11.4 demarcated by dashed lines has an increased transmission compared to the surrounding glass-ceramic material.
  • a display 21 is provided under the glass-ceramic cooking surface 11.
  • the transmission in the display area 11.4 over the wavelength range of the visible light can be designed in such a way that there is less discoloration of the transmitted light beam 54 compared to the surrounding glass ceramic material.
  • Displays 21 and lighting elements 23 can thus be displayed with a greater brightness and a smaller shift in their color location (in particular in the case of spectrally broadband lighting elements or displays, in particular in the case of white light) within the display area 11.4 of the glass ceramic cooking surface 11.
  • the viewing angle of the display is improved by the brightening, as already explained above.
  • the glass-ceramic cooking surface 11 contains suitable coloring metal ions. Initially, such metal ions cause a desired volume coloration of the glass-ceramic cooking surface 11. By partially heating up the glass-ceramic cooking surface 11, for example by means of a laser, and subsequent rapid cooling, the volume coloring can be at least partially withdrawn. On In this way, display areas 11.4 with improved light transmission can be produced within the glass-ceramic cooking surface 11.
  • Fig. 11 shows a schematic side view of a section of a cooktop 10 with a glass ceramic cooking surface 11, a radiator 12 and sensor electrodes 24.
  • the sensor electrodes 24 are arranged as flat metal electrodes between the edge of the radiator 12 and the bottom 11.2 of the glass ceramic cooking surface 11. They are connected via appropriate connection line 24.1 with a suitable evaluation.
  • the sensor electrodes 24 can be pressed flat against the underside 11. 2 of the glass-ceramic cooking surface 11.
  • the sensitivity of the capacitive sensor increases in accordance with the previously described capacitor formula.
  • the smooth underside 11.2 and the reduced thickness 50 of the glass-ceramic cooking surface 11 according to the invention the sensitivity and the reliability of the described system for pot and pot size detection can be markedly improved.
  • the interface between the hob 10 and a user can be significantly improved by the hob according to the invention with the glass ceramic cooking surface 11 according to the invention.
  • the interface is in this case formed by respective contact sensors 22 arranged below the glass-ceramic cooking surface 11, and preferably by associated lighting elements 23 and / or displays 21.
  • the interface can Furthermore, additional sensors are assigned, which allow a simplified operation of the cooktop.
  • the properties of the glass-ceramic cooking surface 11 according to the invention can be advantageously used for a number of other applications. It is thus possible, by means of a suitable underside coating, to apply resistance tracks directly or separately through an insulating intermediate layer to the glass-ceramic underside 11.2. By supplying electrical energy, the resistor tracks can be heated and thus used as a radiator 12.
  • the non-structured underside of the glass-ceramic cooking surface 11, the resistance paths and possibly the insulating layers can be applied with a significantly improved contour sharpness and thickness tolerance.
  • the electrical resistance of the resistance paths and thus the electrical power of the radiator 12 thus formed can be made much more reproducible.
  • the distance between the induction coil of an induction heater used as a radiator 12 and a set up cookware can be reduced.
  • an improved coupling of the cookware is achieved to the alternating magnetic field of the induction heater, resulting in an improved energy transfer with reduced energy losses.
  • the glass ceramic cooking surface 11 may further be broken through holes, for example, toggle or gas heaters are passed through the holes.
  • a glass ceramic plate corresponding to the glass-ceramic cooking surface 11 according to the invention may also be designed as a radiator cover of a radiator, for example a construction lantern, or as a soleplate or as a separating element between a heating device and a useful space in a toaster or as a baking dish or as a heating cover for an oven heating ,

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EP16199998.2A 2016-01-21 2016-11-22 Kochmulde mit einer glaskeramik-kochfläche Active EP3196555B1 (de)

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EP3196555A1 (de) 2017-07-26
CN106989422A (zh) 2017-07-28
DE102016101036B4 (de) 2018-05-30
CN106989422B (zh) 2020-05-08
DE202016103321U1 (de) 2016-07-06
DE102016101036A1 (de) 2017-07-27
JP2017135107A (ja) 2017-08-03
US20170215236A1 (en) 2017-07-27

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